52 lines
1,008 B
Go
52 lines
1,008 B
Go
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package ax
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import (
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"surdeus.su/core/gg"
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)
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// Unique identifier for animation
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// in the animation set.
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type AnimationId int
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// The type describes set of animations
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// to switch between.
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type AnimationSet map[AnimationId] Animation
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// Make new animation set from an image.
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func AnimationSetFromImage(
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img *gg.Image,
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// Width and height of one frame respectively.
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w, h int,
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// Gaps for X and Y respectively.
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gx, gy int,
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defines ...AnimationDefine,
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) (AnimationSet, error) {
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set := AnimationSet{}
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r := img.Bounds()
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fw, fh := r.Dx()/w, r.Dy()/h
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for _, define := range defines {
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animation := make(Animation, len(define.Indexes))
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for i := range animation {
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idx := define.Indexes[i]
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rect := gg.ImageRect{
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Min: gg.ImagePoint{
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idx.X*fw+gx,
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idx.Y*fh+gy,
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},
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Max: gg.ImagePoint{
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(idx.X+1)*fw-gx,
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(idx.Y+1)*fh-gy,
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},
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}
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subImg := img.SubImage(rect)
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animation[i] = gg.NewImageFromImage(subImg)
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}
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set[define.Id] = animation
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}
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return set, nil
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}
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